Outdoor performances due to large mobility, site system equipment are mostly temporary construction, and there are many uncertain factors. Compared with the indoor performance sound reinforcement, there will be more accidents. Therefore, the sounder is also a test of all aspects. The author sorts out this and summarizes all the work in the form of a process. You may wish to do all the work according to this process, which can largely avoid accidents and smoothly complete the tuning task of the performance.
First, understand the relevant tasks, requirements, conditions
1. Ask the person in charge about the purpose of the performance, the type of program, whether there is rehearsal;
2. Site conditions include stage, power supply, etc.
3. Understand the equipment and equipment needed, check the equipment, wire and accessories.
4. Prepare the necessary tools and materials (battery, numbered stickers, etc.).
Second, on-site installation
1, the power supply is determined, pay attention to avoid sharing with the lighting power;
2, the placement of the mixer: as far as possible on the side of the front of the stage, and can observe the stage and hear the clear signal;
3. The speaker arrangement mode is designed according to the specific space of the audience area (can be centralized or distributed);
4, the line distribution, pay attention to the weak signal line and do not walk with the strong signal line.
5, so the cable must be fixed
Third, the sound system test
1. After confirming that the connection lines of each device are properly connected, check whether the push rods and knobs of each device are in the correct position. Then power on, visually check whether the power of each device is powered;
2. Turn off the power amplifier volume output potentiometer and play a familiar music signal (adjusted in the parameter balance of the mixer). Push the total output of the mixer (return output) to 0db, and push the signal channel to 0db. Adjust the gain so that the mixer output level indicator is at 0db (the best signal output state). Check whether the signal indicators of the mixer, each peripheral, and the amplifier are displayed normally.
3. Slowly turn on the volume potentiometer of the amplifier (repeating each amplifier), check whether the corresponding speaker is normally amplified (and check whether each unit is normal);
4. Pull down the total output of the mixer (return output), the volume potentiometer of all the amplifiers is turned to the maximum, and then the total output volume of the mixer and the volume of the listening volume are slowly pushed to 0db. At the center of the audience area (with the stage), check whether the sound is balanced (whether the phase is normal) and determine whether the sound pressure of the music signal is sufficient at each position in the audience area (and the stage).
Fourth, the sound source part of the test
1. The first accompaniment music channel test: adjust the parameter balance of the mixer's music signal channel, listen to the second tone signal, and determine the high, medium and low level of the range.
2. The first vocal microphone channel test: adjust the parameter balance of the mixer's music signal channel, check the microphone pickup sensitivity, observe the mixer signal indicator, and when the signal reaches a certain sound pressure, add the reverb effect and Accompaniment music is initially debugged with singing voice or voice to determine the approximate proportion of vocals, music, and effects.
Fifth, the adjustment of audio processing equipment
1, equalizer: outdoor sound reinforcement, due to the proximity of the free sound field, the equalizer should be placed in the bypass state
2. Compressor: It has two important functions: one is to reduce the dynamic range of the program source, to prevent signal overload and distortion, and to protect the power amplifier and the speaker unit. The second is to improve the loudness of the program (the auditory characteristics can be clearly felt). In outdoor small and medium-sized performances, it is recommended to adjust as follows: the noise gate is placed between open and -20 db, the compression threshold level is between -10db and 0db, the compression ratio is placed at 2:1, and the action time is placed. 10ms, release time is set to 0.3s. (Specific adjustments should be based on the needs of the on-site system and performance).
3. Effect: In accordance with the human voice, adjust various independent and mixed effects programs, audition audition one by one, record the program that can be used in the performance, determine the signal input and output, and select 1~3 suitable effects. According to the needs of the site, you can call it out from the machine at any time during the performance.
4, feedback suppressor: outdoor performance, the general main speaker will not cause acoustic feedback, the main cause of whistling is to listen to the speaker, you can use the feedback suppressor to automatically set the return channel
5. Delayer: If the venue is large, and the sound reinforcement of the line array is not the main speaker and the auxiliary speaker, the delay of the auxiliary speaker signal, the value is estimated by the distance of the main and auxiliary speakers, 34m is 100mS , 17m is 50mS, 10m is 30mS.
Sixth, the total system sound amplification test, after the equipment is adjusted, the overall sound quality check
1, the requirements of the music signal should be strong, fullness, high-pitched can not be harsh, the bass can not be turbid.
2. The requirements for vocal signals (adding effects) should be round, full and hierarchical, and have a sense of presence.
Different music and different people will make different changes in the sound quality effect. In this case, appropriate elevation and attenuation should be carried out in the parameter balance on the mixer.
Seven, the stage before the show (rehearsal)
1. Collect music accompaniment bands and arrange and classify them. (The grass-level performances are mostly amateur performances, the program is self-directed and self-directed, and there are many types of accompaniment. Therefore, the performance must be arranged and classified before the performance: the corresponding program list uses the sticker number, and the collected accompaniment is registered on the program list, and classified. , for example, the tape is represented by T, the VCD disc is represented by V, etc.);
2. Determine the male and female host microphones, singers singing microphones, and use the sticker number;
3. Ask the dancers to determine if there is a “styling†at the time of appearance (eg, whether to put the dance style first and then put the music, or put the music actor on the scene first) and record it on the program list;
4, for the special requirements of the actor (such as the essay requires to play music at a certain time; the singer sings, but to speak in the middle; the actor on the side of the program to explain, etc.), should be recorded in the program list, and Arrange a staff member for assistance.
5. Confirm the number of microphones and microphone holders used in the performance, place them on the program, record them on the program list, and arrange for a staff member to assist.
Eight, preparations before the show:
1. Ask the person in charge to make sure that several leaders are giving speeches on the stage and arranging microphones.
2, ask the person in charge, determine the music and end of the music, and agree with the host to the time of the music;
3. For important performances, all new wireless microphones are used.
4. Check the music accompaniment disk and make sure that there is a music signal within 1 second after pressing “PLAYâ€;
5, carefully analyze the program sequence to see if there is a conflict in the microphone distribution, and pull the microphone switch to the "ON" position, wrapped with electrical tape;
6, call the sound staff, arrange the division of labor cooperation matters (such as: responsible for the arrangement of the microphone and power check, responsible for the placement of the microphone stand, the play of the program, etc.).
7, time is allowed, the accompaniment music should be fully tested into the laptop, and number description
9. During the performance period:
1. Pay attention to the volume balance of multi-supported words, the balance of vocals and music signals (the different pickup distances and pronunciation of the performers can cause the signal of the originally debugged microphone to be weak);
2. For the actor who is performing on the stage, suggesting that the volume is insufficient, the system signal level should be taken as the standard and reasonable adjustment should be made;
3, there is a cold field, watching the development of the situation and strain, if it is an actor problem, follow the arrangement of the stage director; if it is equipment failure, quickly identify the cause, report to the stage director in a timely manner and take effective "rescue" measures.
Ten, the end of the show
1. Hand over the accompaniment of the program to the relevant responsible person for return;
2, cut off the power supply in the prescribed order
3. Take out the battery inside the wireless microphone.
4, the various cable classification is rolled up, put into the toolbox
5. After the heat dissipation is completed, all equipment and equipment will be loaded into the air box and locked, waiting for loading.
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